There is probably no single woodworking health or safety
issue that is kept more "silent" than dust ingestion. Only in recent years
has the woodworking community started to take their respiratory health
quite seriously. Wood dust is now classed as carcinogenic by many
authorities around the globe, so it is even more important than ever to
make sure your lungs are protected from breathing in harmful dust
Often you cannot see the dust in the air, and by this
stage, the chance of catching it is less than if it is caught at the
source. So today, we are going to look at another vacuum-type dust
extraction machine designed to catch dust at the source, and to clean up
later if needed. Regular readers may recall we reviewed a Festool
extractor fairly recently as well.
The product is the Karcher 361 Eco TE, and we specially
selected this model from their range as it offers features that are most
suited for use with woodworking tasks and tools.
Packaging and Assembly
We received the 361 Eco TE boxed and partly assembled. Once you
extract the various components, manuals and miscellaneous bits and pieces,
you can start to assemble the unit. Actually, assembly is almost a
no-brainer as all you need to di as attach the pivot wheels to the front
of the unit (they push in) and attach the larger main wheels at the rear
(no tools required). Once the wheels are on, simply attach the tool
holding components to the back and assemble the various rods that make up
the upright vacuum handle (if needed). Pretty easy stuff. The manual
outlines assembly requirements if you are not the world's best machinery
or tool assembler.
The printed manual outlines all assembly, operation instructions and
specifications for the tool. It is printed in just about every language
known to humans, except perhaps Egyptian hieroglyphics! The line-art type
drawings are very clear and instructions are direct and to the point,
which helps eliminate any possibility of confusion. Take particular note
of the instructions because many of the features of this unit have
specific instructions for use. Also take note of the machines
specifications and maximum connected tool wattage allowable.
And speaking of specs, here are the listed specs for the Karcher NT361
Eco TE dust extractor:
- Motor - 1200W (normal operation) - 1380W
- Collection Capacity - 34 Liters
- Air Volume Moved - 56 Liters/sec (max)
- Hose Diameter - 35mm
- Pressure - 235 mbar (max)
- Sound Emission - 63 dB
- Cord - 7.5m long, 15A plug
- Weight - 9.5 kg
*Note, motor specifications and electrical
connection for models sold in
the USA, and other parts of the world may vary accordingly.
As you can see from the above list, the Karcher NT361 TE
features a 1200W motor and can consume 56 liters of air per second. In
qualitative terms, these figures really suck! I'm speaking literally here,
the NT361 TE has very good suction capabilities that exceed many other
similar vacuums and shop-vacs of similar size. In testing, we found little
tendency for the machine to lose suction, except when the bag was perhaps
reaching 90% or more capacity, but this is to be expected. We hooked the
NT361 TE up to numerous tools in the workshop during the test period and
dust extraction performance seemed to be very good. it is hard to judge
just how efficiently the unit works because some power tools are designed
better than others in regard to dust extraction. However, one tool with
very good dust extraction features is the Festool OF1400 EBQ router, and
when hooked up to this tool, the NT361 TE left almost no sign of dust or
debris in trenching work, and performed similarly well on edge profiling
work using the Festool's chip deflector attachment.
The hose features a tapered end connector which offers the
user quite a good range of inside and outside connection diameters. This
combination allows the hose to be hooked up to any tool with the following
dust port diameters (in millimeters);
- 21.5, 26, 26.9, 31, 32, 35.
Given that the end connector is also made of rubber, there
is some flexibility to adapt to dust collection ports with diameters close to those
figures as well.
The NT361 Eco TE also ships with some standard vacuum rods and accessories
so the unit can be used for everyday vacuuming tasks, or for general
cleaning of the workshop. These attachments are shown on the image at the
top of this review and in images in the right column. We used the unit on
routers, hand-held sanders, for collection on the bandsaw, and on the
biscuit joiner, among others. Perhaps it was just luck that the
multi-stepped connector fit all these tools with no additional attachments
A 34 liter collection capacity is a good size for a shop-vac.
Not so small that you have to be changing collection bags every day, but
not so large that it makes the machine difficult to cart around the
workshop. The package comes with one collection bag. To fit it you must
remove the top cover of the 361 by unclipping two latch clips, one of each
side of the unit. The whole top assembly then just lifts off to expose the
motor, filter, and collection space. You then just attach the collection
bag into the base of the unit and it is a simple push-fit. Naturally, you
do need to buy the bags from Karcher that will fit the vacuum port. These
are sold in lots of five. Depending on how much woodworking you do and
what tools you use the vacuum on will determine how quickly the bag fills
up. The bag catches almost all the dust and chips. Naturally, some really
fine dust will find its way through, and this is where the in-built filter
comes into play. This fine dust will be captured by the air filter before
the air is exhausted from the machine back into the ambient air. Karcher
claims a dust retention figure of greater than 99.9%. I simply don't have
a laboratory or test equipment to confirm this. My best effort was to
place a direct halogen light source over the exhaust air stream to see if
I could spot any dust particles being emitted from the machine. Even so,
it was difficult to see any, and that air could possibly be contaminated
by air ambient dust floating in the workshop air anyway. I think in this
case, we will just have to take Karcher's word for it in this instance. I
certainly did not experience any noticeable dust ingestion problems when
using the extractor with tools I know would give a problem without dust
extraction in place.
Cleaning the air filter is a simple process. Just position
the red filter clean slider on the top of the unit in the down position.
Now push the trigger on the end of the hose down and hold it for a few
seconds. This directs air over the top of the filter and pulses air bursts
to help push fine dust off the filter surface itself. It seems to work
well in use and should be done after heavy vacuum loads or at least once
per day during normal use. Because of its simplicity, compliance is almost
a certainty. It is one of the nicer features on the 361 Eco TE model.
The best feature however, and one that should be on ANY
vacuum or vacuum extractor you buy, is the integrated power outlet. Simply
plug in your power tool (up to the maximum wattage approved in the manual
for your country) and the extractor will turn itself on and off in
accordance with your power tool. For example, when I plug a router into
the extractor's power point, and then turn on my router, the extractor
will switch itself on automatically. There is a small delay so as to not
overload the circuit from the electrical burst that occurs in the
milliseconds of tool startup. Once I switch the router, or any other power
tool attached off, the vacuum continues on for around 15 seconds to ensure
all dust is extracted from the hose and from around the tool's dust port.
Naturally, the advantage this offers is that you do need to manually turn
on two devices, and two two off separately. From a convenience and time
standpoint, it is a real winner. On the unit we tried, the minimum
connected tool wattage is 100W, and the maximum was 2200W, but again,
check the manual for your country as these figures vary depending on your
power supply. The green lamp next to the power outlet will light up when a
tool is plugged in as a visual indicator to the user. The large top grey
push button that can be seen in the images to the right is the main ON/OFF
switch for the 361 Eco TE.
When it comes to sound emission, the 361 Eco TE gives off
63 decibels (dB). This is a very comfortable sound level for a unit of
this size, and is 9 dB less than the Festool model we have reviewed
previously. I'm waiting for the day that someone comes out with a 'silent'
dust extractor, but I think I'll be waiting a little while yet, but the
lower sound emission from the Karcher extractor is certainly very
welcoming, and one of the quietest extractors I have seen so far. I do not
feel a need to use ear plugs during general cleaning tasks with this unit,
however, if you have those ear muffs with radios built in, why not enjoy
the music :)
Mobility wise, the Karcher NT361 Eco TE features four
wheels. Two smaller pivoting wheels at the front of the unit, and two
larger, non-pivoting wheels at the back. Dragging the unit around the shop
is generally not a problem, although we found the Festool model was a
little smoother. Nonetheless, the 361 is very mobile, and can of course be
easily picked up and carted around if needed. Its weight of 9.5kg (roughly
21lb) should not be too much of a problem for most and a top-mounted
handle provides for an easy lift. The 7.5m (25 ft) power cord reduces the
need for extension cords and can be wound around the back of the unit to
keep it neat and compact. The hose can be attached and removed easily as
In the Shop
As mentioned above, this unit has great application for woodworkers.
While the larger high volume, lower pressure dedicated dust extractors are
a must in the workshop, the humble roll-around vacuum systems are just as
important for catching dust from hand-held power tools and stationary
machines that have smaller dust ports. We used the Karcher extractor
attached to a home-made router fence and it did a great job of collecting
most of the dust and debris above the table. It would be good if there was
some type of "Y" junction attachment available for this unit that allowed
you to use two hose sections simultaneously. One for collection above the
router table, and one for the dust port on the router itself. I am not
aware of such an accessory for this unit at this stage.
If you are looking to improve the dust collection
capabilities of your workshop, and thus, greatly improve your respiratory
health and save lots of time in shop cleanup, a vacuum-type extraction
unit along the lines of the NT361 Eco TE would be well-worth considering.
Whatever you buy, make sure it has the integrated power tool port, a good
size dust capacity and good quality filters. Look for a model with lower
sound emissions too.
I was quite happy with the performance of the Karcher NT
361 Eco TE. It certainly matches the Festool model in terms of extraction
potential, and achieved this with a lower sound emission. On the flip
side, the Festool does have more accessories available for it that are
useful for woodworkers (including anti-static hose) and does move around a
little better. In saying that however, I think both models would please
the woodworker looking to capture more dust at the source.
The Karcher NT361 Eco TE is certainly an industrial quality
vacuum system, and the price reflects this at around, or a little under
AUD$999.00. Given its performance and features, this model is certainly a
case of "you get what you pay for".
The Karcher NT361 Eco is also available in the USA and retailed through
Tornado Industries Corporation.
Note that the non-TE model of the NT361 can also be used
for wet-vacuuming purposes. The TE model is for dry vacuuming tasks only.
Karcher 361 Eco TE Photos
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written permission prohibited
The Karcher NT361 Eco TE
A "must-have" feature is the integrated power tool port.
Multi-stepped rubber connector fits to many tool dust extraction ports.
Exhaust air port, plus latch to remove top and expose filter and
Here you can see the collection bag installed and the air filter behind
the enclosed motor.
A place to hold your accessories.
Note the top grey ON/OFF push button, flip down cover for tool port and
green connected tool indicator lamp.
Using the NT361 TE Eco extractor hooked up to a router.
It also works equally well hooked up to the dust port on the router